Though widespread, the practice of public subsidies for cultural activity lacks a rigorous and consistent economic rationale. We analyze a canonical market structure that characterizes much cultural activity: the competition of mass-produced goods with heterogeneous non-standardized goods that are imperfect substitutes. We analyze several types of market failure: uncertainty about preferences (we don’t know what we like, and we don’t know what we might like in the future); endogeneity of preferences (we like what our neighbors talk about, and we like what we’re accustomed to); and externalities associated with production (future production costs are determined by current production). The model provides a basis for cultural subsidies to promote social welfare and economic development.